Density Calculator
Calculate density, mass, or volume using density = mass/volume.
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How It Works
Calculates density (mass per unit volume): D = Mass ÷ Volume. Density determines if an object floats (less dense than water = 1.0 g/cm³) or sinks.
Formula
density = m / VQuick Reference
Common calculations — results you can verify instantly.
Water
1g per cm³
1.0 g/cm³
Iron
7.87g per cm³
7.87 g/cm³ (sinks)
Ice
0.92g per cm³
0.92 g/cm³ (floats)
Tips & Shortcuts
Water density = 1.0 g/cm³ at 4°C. Objects less dense than this float.
Air density ≈ 0.0012 g/cm³. Iron = 7.87 g/cm³. Gold = 19.3 g/cm³.
Density changes with temperature — most materials expand when heated, reducing density.
Common Mistakes
Mixing up mass and weight in density calculations
Density uses mass (kg or g), not weight (force). Use a scale that measures in grams.
Using inconsistent units
If mass is in grams and volume in mL, density is g/mL = g/cm³. Keep units consistent.
Frequently Asked Questions
Water displacement method: submerge the object in water and measure the volume increase. That volume equals the object volume.
Ice (0.92 g/cm³) is less dense than liquid water (1.0 g/cm³) — unusual for a solid. The hexagonal crystal structure of ice creates a less compact arrangement.
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